Furnace-grate.



R. GRABOWSKY.

FURNACE GRATE.

APPLICATION FILED APR.22,1913.

1,107,292. Patented Aug. 18, 1914,

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FURNACE-GRATIS.

memes.

To all whom it may concern:

Be. it known that I, RoBnRrGRABowsKY, a subject of the Emperor of Germany, resid ing at Hanover, Germany, have invented certain new and useful Improvements in Furnace-Grates, of which the following is a specification.

This invention relates to hollow water cooled grates of a type wherein grate bars are used which are formed with a longitudinal partition wall, the water being caused to flow out along said bars at one side of the partition and to return along the other side thereof.

It is the object of this invention to provide an improved type of grate bar for use in such grates; further, to provide an improved water inlet and outlet shell connected to the set of grate bars and supplying the water thereto, and to provide a construction wherein all permanent joints can be made by means of welding whereby the risk of straining and consequent leakage is reduced to a minimum.

Other objects will appear from the fol lowing description.

In the drawings ;F igure 1 shows a cross section of one form of water chamber, with a grate bar (partly broken away) attached thereto, and also a cross section of the grate bar. Fig. 2 shows a view of part of the water chamber as seen from the left side in Fig. 1, the cover plate being removed. Fig. 3 is a partial sectional view showing a modified form of connection between the water chamber and the grate bars. Figs. 4 and 5 are detail views showing particular forms of grate bars suitable for use according to the invention.

Referring first to Figs. 1 and 2, it will be seen that a set of grate bars a with longitudinal partitions z' therein are attached to a water supply shell or box having a.lower water inlet compartment a, and an upper water outlet compartment a, separated by a partition I). The box has its top and bottom walls (Z, d and its end walls 6 made from a single strip of weldable or forgeable metal bent to the shape shown, and welded t0- gether at its ends. The rear wall 70 is a separate metal plate which is subsequently welded in place after the grate bars 0 have been welded to it, while the front wall 7 forms a removable cover plate which is normally held in place by bolts 9 and nuts.

Specification of Letters Patent.

Application filed April 22, 1913.

Patented A11 18, 1914.

Serial No. 762,759.

In fitting the parts together, the grate bars 0 have their open ends inserted in openings in the plate is and welded therein, after which the rear edge of the partition I) is welded to the plate is and to the ends of the grate bar partitions 2'. Hereupon the plate It is fitted to the back of the box formed by the walls (Z, cl, 6, and its periphery is welded thereon, and then the ends of the ]partition Z) are welded into the ends 6 of the In the alternative construction shown in Fig. 3, the ends of the grate bars 0 are made to butt against the Wall 72 and are welded thereto in that position, while the partition 5 has extensions projecting into the ends of the grate bars and meeting their partitions i. The partitions 2' do not extend quite to the outer closed ends of grate bars as seen in Fig. 1, but a space is left for the water to flow up from the lower side to the upper side of the partitions 2'- therein.

The bolts 9 are welded to the Walls d, d, c, of the water box, as are also the pipe joint sockets h and h by which thewater is let into and away from the compartments a and a respectively. In this way an extremely strong construction is produced wherein the bars and the water feed box are all in one piece, welded together so as to leave no joints which are at all liable to give rise to leakage or other trouble. The only removable part is the front plate f which must be removable for inspection and cleaning purposes, but which is never very much heated in any case nor subjected to serious stresses.

The grate bars are preferably formed as indicated in Fig. 4 or Fig. 5. In either case the bar is made by folding and forming in a rolling operation, from a strip of metal with longitudinal ribs or projections which when brought together form the partition 2'. The top of the bar is at the middle of the strip, and the edges of the strip are brought together and welded to form the bottom of the V-shaped bar. In order to make a substantially watertight joint between the two ribs forming the partition 2', the one is preferably formed to engage in a recess or groove in the other as shown. The bars may be formed and welded together also in any other convenient manner to produce the desired form thereof.

The grates may be made of any required size or length and With any required number of bars arranged side by side.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is

A grate bar applicable to grates using; liquid cooling, the said bar consisting of a single sheet of material folded over and Welded together to form a V-shaped hollow 10 bar, the sheet having projections thereon my hand in presence of two subscribing Witnesses,

7 ROBERT GRABOWSKY.

W'itnesses ARTHUR J. BUNDY, FRANZ OLSAMOSKI.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

4 7 Washington, D. 0. 

